Originally Posted by sospan
It’s a shame there isn’t an air bleed valve in the top hose from the radiator. I had a Renault with one and it helped immensely to bleed air from the high part of the system, where it migrates to. .

I fitted one to my 4/4 into the heater circuit. Fitted a longer hose so it was above the radiator and heater matrix at the highest point, and put a bleed valve point in. Not sure if it's possible to do something similar on the +8

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1972 4/4 4 seater, 1981 MGB GT
1984 Harley Davidson Electra Glide, 1990 Kawasaki ZX10